Alternate tone receiver and method of signal transmission and reception



J. D. DURKEE June 7, A1960 2,939,912 HOD oF SIGNAL PTION ALTERNATE TONE RECEIVER AND MET TRANSMISSION AND RECE Orlglnal Flled Aug '7, 1953 4 Sheets-Sheet 1 INV ENT OR mwr uw kg@ NR Y n .R w

ATTORNEYS June 7, 1960 2,939,912 IGNAL DURKEE VER AN ALTERNATE TONE RECEI D METHOD OF S TRANSMISSION AND RECEPTION Orlglnal Flled Aug 7 1953 4 Sheets-Sheet 2 R O I1 M. m e 9 n E M u ...l w N EN A vxN u H .N NQN www N me S O mm l EN v o N a u .me J IP H www M Q .msm H l@ SN o 0 h6 9 o o O o /N \m,\N Q\v 5 BY f4/mg Wwf@ ATTORNEYS June 7, 1960 .1. D. DuRKx-:E 2,939,912

ALTERNATE TONE RECEIVER AND METHOD OF SIGNAL TRANSMISSION AND RECEPTION Original Filed Aug. '7. 1953 4 Sheets-Sheet 3 1. D. DURKEE RECEI June 7, 1960 2,939,912 on 0F SIGNAL.

ALTERNATE TONE VER AND METH TRANSMISSION AND1 RECEPTION Original Flled Aug 7, 1953 4 Sheets-Sheet 4 IN VENT OR ATTORNEYS @L r" nunon l l un Q N nited i States ALTERNATETONE RECEIVER AND METHOD F SIGNAL TRANSMISSION AND RECEPTION Aug. 7,

Continuation of application Ser. No. 372,907,

1953. Thisr application Aug. 29, Y1958, Ser. No.

.158,652 i z3 claims., (c1. 11s-s4) The present invention relates `to-alternate tone trans- 93am i Patented June 7, 1960 eey severe limitations on `the rate of transmission and on mission and reception of functional signals such as the signals used in printing telegraph systems and toa method ofg signal transmission and reception. i r A This application is a continuation of application Serial No.,372,907, tiled August 7, 1953, now abandoned.

The invention is concerned with a methodfand apparatus for transmitting and receiving alternate tones as a s ignal, leach tone consistingof a single frequency. Each sig-` nal=to be` transmitted lis, compressed or converted into` YaI conventional live-unit code. Thus, each functional intellithe compatibility of` sequential systems with systems of other types or of different synchronizing rates.

My alternate tone system transmits and receives single frequencies or pure tones during each signal phase. I thus greatly reduce the possibility of, loss of information in signal transmission and I` thereby reduce the likelihood of erroneous reception. The transmission and reception o f a single frequency at any onetime permits the different frequencies to havervalues relatively close together and the wave band can be rather narrow. My alternate tone system requiresno `synchronization with respect to time between the transmitter and the receiver. In my system thereis not*,'strictly speaking, an olf time, or at least an olf time is not required. My system provides a two-phase signal whichcan useall of the available time. The irst phase of my signal is transmitted and received and is im- A mediately followed by the second phase of the signal.

gible signal, as for example each letter of the alphabet,

is represented by a unit or combination of units of a fiveunit code such as the Baudot code. The tive-unit code is then arbitrarily separated into two components, of preferably two elements in onewof the components and three elements in the other component. A matrix is pro- 1.

vided for expanding thetwo-element component by binary progression into a group of four parts. A second matrix expands the three-element component` by binary progression into a group of eight parts. Such binary progressionv has reference to a geometric progression or series wherein the parts progress in relation to one another bya con-` stant `factor of two, as for example one, two, four,f"eight. Individual single frequencies are provided for each part of each group. A single frequency is selected from the fourpart group and a single frequency is selected from the eight-part group to form a character or signal. The single frequency selected from the four-part group and the single frequency selected from the eight-part group are individually transmitted in sequence to provide-first and second signal phases, each phase consistingof a single frequency. The five-unit code need not be divided into components consisting of two and three elements, `although thisis preferred and the invention will be thus illustrated and described.. The five-unit code could be arbitrarily separated into components of one` and four elements and in thatcase the one-element component would be expanded by a matrix into two parts and the fourelement component would be expanded by a second matrix into 16 parts. `In either event, the arrangement permits transmission of 32 functional signals.

The system is, strictly speaking, an alternate tone system as distinguished from either a simultaneous tone or sequential tone system. There are many advantages in using my alternate tone system over the systems heretofore used. In the simultaneous tone system, a plurality of tones or frequencies are superimposed on each other and are transmitted simultaneously as a composite signal. The total power in the composite signal must be distributed among the number of frequencies or tones constituting the signal. Furthermore, due to selective fading and otheratmospheric phenomena, the possibility exists for loss of power in one or more of the tones constituting the signal. Loss of a component of the simultaneous signal results` in erroneous reception.

t In a sequential system, a plurality of dilerent impulses are transmitted one after the othen In such ae- It might beustated` that the second phase of my signal can `be transmitted and received during the time interval which would be the space or olf time in any sequential or on and off system. The second phase of my signal may be lfollowed immediately by the first phase of the next `signal. A basic distinction between my alternate tone Ys ystemand a sequential system resides in the fact that the sequential system the off time or spacing impulse always means the same thing, whereas in my systern there is no olf. time and the first and second phases of thesignal mean different things, thus making it possible to transmit bits of intelligence during each signal phase. In my system, -the execution of the printing function is initiated in the second phase of the signal and may be completed in the first phase of the succeeding signal. Thus, the full time of each signal phase may be utilized for the essential function `of determining the intelligence or;` information .contained therein. 1

My alternate tone system retains compatibility with the existing Alive-unit teleprinter code. In other words, my transmitter can be directly keyed with the existing conventional five-unit code keyboard and the received signal can be lreconverted into its original five units and used on'lconventional teleprinters by the use of a suitable converter@ r The primary objects of my invention are to provide an improved system of signal transmission and reception which retains compatibility with existing systems, which is capable of utilizing all the time available during each signal transmission for the essential function of determining the intelligence or information contained in the signal, which permits use of a narrow wave band, which reduces the possibility of loss of signal components in transmission, and which requires no synchronization as between the transmitter and the receiver. Another object of the invention is `to provide a signalling system which can be operated at any desired speed of transmission and which overcomes the present necessity of transmitting only at a fixed rate.

Still another object of the invention is to provide a methodand apparatus for'signal transmission and reception which involves converting the character to be transmitted into ahve-unit code, arbitrarily separating the five-unit code into a rst component of at least one code unit and a second component of the remaining code units, expanding the first component into a rst group of parts, expanding the second component into a second group of parts, assigning individual frequency identities to each part f each group, alternately transmitting a single part l122,939,915@ I i A Y I j from the-first group land asingle part from the second group as iirst'and second signal phases, receiving-the signal phases, utilizing the rst signal phase at the receiver to perform part of the operations necessary to recordation of the signal'transmitte'd,1and utilizing thefsecoiid phase of the signal at the 'receiver to eoijn'p'letctheoper-'a-l tions necessary'to recordation of Vthesignal.A

Other objects and .advantages of' Y ter-invention will be pointed out in the Vfollowingdetaileddeseriptionof an exemplary embodiment-`ot the invention. Thisf-descrip' tion has reference to the accompanying,drawingsfwherein: i Y

Figure 1 is agr-Wiring diagramfo'f-l'a transmitter, ll'contacts being shown in lthe positions which they occupy 'when the relays are'not energized; Y

Figure 2 is a wiringdiagram of-a receiver intended Vfor use with'fa tape `printer;Y

" operating coil 41 or a relay which is designated generally by the reference numeral 42. The current passes'from the operating coil 41 to a negative voltage source 43. A. capacitor 44 and a current-limiting resistor 45 serve to keep the relay 42 energized foraA controllable time period after the armature 34 has disengaged the contact 35. The armature 46 v.engages ycontact 47- when they` relay 42 is energized, and armature 48 engages-...contact 'Sjwhen that relay is energized.

' energized. Energization of the relay '-11 causes the 'icon- Figure 3 is aAv-i'ew 'partlyfi'n side yelevation and partlyin Y cross-section'of aftype'tont andimechanism for angular orientation thereof; l

Figure 4 is a similar 'v-iew'ofv-mech'anisrn for' securing rectilinear orientation of the type f'ntganfd g Figure 5 is a-lwiring 'diagram pfafreceiver intendedfor luse With'fa tape perforator oriforuse -with a `conventional teleprinter of theive-unitsequential tone type.

Description t of `the 4transmitter The transmitter illustratedinfFigurel isfdescribedI and particularly claimed in -jmy-"co'pending :application Serial No. 348,260, iiled`April13,`1-9`53.

The 'reference 'numerals 1; 2, V3,111 and 5 designate switches which may beactuated byj an keyboard, fsuch 'las thatillustrated'in 'my copending application Serial No. 369,033, filed September V11,y 1952,i entitled' PrinterfFor Communications Systems, nowv Patent'f2,'742,532. Various combinations of Vthe-switches 1 to 5 are closed'on de-y pression. offkeys of the 'l keyboard. Alternatively, "the switches-1 toIS may be the'contacts-of a ytape transmitter unit of the kind currently used inteieprinter operations;V

In the tape transmitter unit, various combinations of the switches 1`to 5 vvv'ill be closed on passage of 7al perforated:

tape 'throughthe unit.

- gagernent with the lcontact $6.` Energization ofthe relay.

tact arm 52 to engage the contact 56. The armaturev of the relay 12 is designated .by thereference numeral 57 and controls contact'arms'58 and259. A spring member 60 urges the contact arm 58 Yinto `engagement withwthe contact 61 and urgesthe contact larm 59 into engagement with'the contact A62 whenthe-fr'elay 12 is notenergized;v Energi'zationiofAv tlie'- relay 12 causes the contact arm58 to engage the contact T63 and alsocausesthe contact arm 59 engages the cont-aet'r64.V The-:armature of -relay`13- is designated'by the reference numeral'65 and Vis used to control contacttarms-' 67, '68, airid69. VWhenthe'relay-)IS is not energized; asp'ring member 70 urges the contact arms 66,167 ,"68 andf69`into`A engagement with the contacts 71,

`83. nWhen* "theV relay `lefis not energized,a spring member S4'urgeslthe contact Yarm 82V into engagement with the contact'SS and also urges' the Ycontact arm SSinto en- 14 causes thecontact arm- 82 to-en'g'ag'e the contact 37 and The reference numerals 6, 7,53, 9`ar'1`d design-ate the y' individual operating coils of a'series of relays which are designated generally byV the-referencenumerals Y11,12, 13, 14 and15. Therelays 11,"12and' 13 Varegprovided with locking coils 16, 1-7fand'1,'-'respectively, theseflocking"coils being Wound 'onv thesame pole pieces as the rcoils 6, `7 andct. The relay '11vv is provided' with Vcontacts'n19 Which'close'on energization of the relay vfor 'closing'a circuit to the locking coil 16. VFfhe relays 12 and 13 arefsimilarly provided with contacts 20 and 21` for closing thefcircuits to the locking coils 1'7 and 1S, respectively. yRelay 11 is provided with av capacitor 22 which is connected in parallel with the coil'11. Relays 12'and 13 are provided with similarly connected'capacitors 23 and'2f. The relays 11, 12 and 1'3 are also provided'with current-limiting resistors 25, 26 and 27 Which a-re inseries connection with the capacitors 22, 23 Vand y24, respectively.

The relay which is designated generally'by the reference numeral 30 is provided with an operating coil 31 which is connected in series With the contacts 1, 2, 3, `4, and 5 between aV positive voltage source VIZand-the operating coils 6, 7, 8, 9 and 1G. VThe negative voltage source isindicated at 33. The relay 311 willv be energized when'any one of the contacts 1 to 5 or any combination ofthose contacts are closed to pass current through any one orfany combination of the operating coils 6 to 10, inclusive. Theu'elay 30 is of Vthe double#poledoublethrow' type. Thearm'ature 34 engages contact 35 when the'relay 30 is 'energizedfand engages contact'when therelay is deenergize'd.y YArmature 37'engages contact38 Whenthe relay 313 `is 'energized and engagesv contactlwhen therelay 'isfdeenerg'ized-fEngagement of the contactSbylthe armature 34 Vcauses causes thefcontactfarm 83 toengage'the contact AS8: The relay'l'is'provided with an -armatureSQ Whichconf trolsfthe position elta contactvarm 9). A spring member 91 urges fthecontact arm 90 into engagement with the eontact92i4 when *the* relay 15 is` not energized. `Energizationuof the relay 15 causesthe contact'arml 90 to engage thecontact'93. A

hThe Vreference numerals k101, 102,103, 164,105, 106,' 107, 108, 169, ",116, 111 and 112 designate individual audiofrequencyidetermining elements. These frequency- YdeterminingV elements may be individual audiooscillators of different-frequencies or lthey maybe EVfrequency-conf` trollingicomponents of a master audio-oscillator, aswill befapparenttothoseskilled in the art. For pu-iposesof vfurtherdiscussion, it will be assumedl that the' re'quencyf determining means 191 tty-11:2 arev individual 'oscillators Wliichlareconnected 'bymeans of a common line 113 toan audio-amplifierlii. As indicated above, the numeral 114 may ldesignate a--master audio=oscillatorwho`se frequency is determined by the vaine vof'frequency-detern'iinin'g components corresponding tothe individual oscillators 101'to` 112.A The'reference numeral 115`design'atesa linearnpli-A fier or the modulating'sys'tem of a1 radio frequency transmitter. l -fperarion of h'efransmzter For thepurpose of .describingthe-.operationlof A.the transmitter, it will beassumed Ithatit is.desired:to.trans mit-.thefletter YJ .Depressiomofnthe Y keyrat the keyboard -Will .close .the .contacts .11; 3.fand- 5. :Alterna` tively,the; contacts 1,3 and 5maybe'closedxbyearitap'e' transmitter. Closing of --these .contacts :causes :currentito flow from vtheipositivevoltage:source32throughgthecoil 31 fof 'relayiand through the coils-i6, 'Sfiandllot relays :1.1, f-13and 215 `Ito thenegative volta'ge.soure'e 33. Current fiori/ing through 'opeatin'gcoil "6 'energizesrela-y 11,l closing contacts 19 fand causing'contact armrf52 to erfgag'eccontactjf56. lCurrent owingjthrough operating;

associa coil 8 of relay 13 closes contacts 21 and causes contact arms 6 6, `67, 68 and 69 to engage contacts 75, 76,77 and 78, respectively. Current owing through operating coil 10 energizes relay 15 and causes contact arm 90 to engage cont-act 93. The llow of current through coil 31 energizes relay 30, causing armature 34 to engage contact 35 and also causing armature 37 to engage contact 38. Engagement of contact 35- by armature 34 causes the relay 42 to be energized to engage armature 46 with contact 47 and to engage armature 48 with con tact 49.

Under `the circuit conditions outlined above, the `first phase of the fY signalwill be transmitted as the individual frequency of the oscillator110. The circuit for transmission of the first signal phase can be traced as follows:f From the input terminal 116 of the audioamplifier 114 to the contact `49, the armature 48, the armature 37, the contact 38, contact arm 90, contact 93, contact arm 82, contact 85, oscillator 110, and common return line 113 to the terminal 117 of Ithe audio-amplilier 114.

During this lirst phase of the signal, the oscillator 110 is the only oscillator which is connected to the audioamplifier 114.' =None of the oscillators 101 to k108 are connected to the audio-amplifier because of the fact Ythat the contact 39 is not in engagement with the armature 37. The oscillators 109, 111 and 112 are not connected with the audio-amplifier because of the positions of the contact arms 82, 83 and 90. A The Y key is then released and the contacts 1, 3 and are broken. Relays 15 and'30 are immediately deenergized, but the `capacitors 22 and 24 prevent relays 11 and 13 :from being deenergized for a brief interval which is suiciently long .topermit armature 34 to engage contact 36. Contacts 19 and 2.1 will beheld closed during this brief time interval by virtue of the fact that the relays 11 and 13 remain energized. Y The capacitor 44 will prevent the relay `42 from lbeing immediately'deenergized. Current can then ow from the positive voltage source 40 through the armature '34, contact 36, armature 46 and contact `47 to the closed contacts 19 and 21 and through the locking coils 16 and 18 to the source of negative voltage 118. The relays 11 and 13 Vwill thus be locked in energized positions. The circuit is then in condition for transmission of lthe secondv phase of the signal.

The second phase of the signal consists of the individual frequency of the oscillator during the second phase of the signal may vbe traced from the input terminal 116 of the audio-amplifier 114 through the contact 49, armature 48, armature 37, contact 39, contact arm 52, contact 56, contact arm 58, contact `61, contact arm 67, contact 76, oscillator 103 and return line 113 to the terminal 117 of the audio-amplifier 114. The oscillator 1103 is the only oscillator which is connected to the audio-amplier 114 during the second phase of the signal. The second phase of `the Signal will `persis-tuntil the energy stored in the capacitor 44 is dissipated, permitting relay 42 to be deenergized to separate armature 44 from contact 49, or until the iirst phase of a new signal-begins through depression of another` key of the keyboard. i .4 It will be understod that the frequency of oscillator 110 represents the code element corresponding to contacts 5 and that the frequency of oscillator 103 is representative of the combination of code elements corresponding tocontacts 1 and 3. t For purposes of further illustration let it be assumed that it is desired to Itransmit the letter H. The depression of the H key .will cause contacts 1 and 3 to be closed. The first phase .of the signal would normally consist of .thefrequency of the-oscillator 112' and the second phase of the signal would consist of the frequency of 4the oscillator 1,03. However, afrequency designated as zero can be ,usedin either phasevof the signal and 103. The circuit oscillator 112 could be elimin ted, in which case lthe lrst phase ofthe H signal would consist of the zero designated frequency. If the oscillator 112 is retained as the frequency designated as zero, oscillator 108 could be eliminated or vice versa.

It will now be clear that'by the various combinations of the ve elements of theteleprinter code the 31 characters of that code can lie-transmitted as alternate tone signals. The rst phase or tone of the signal represents al combination of code elements corresponding to contacts 4 and 5 and the-second tone or signal phase represents a combination 'of code elements corresponding to contacts 1, 2 and 3. While I have illustrated the five- 'unit .code as having been arbitrarily separated into a iirst component consisting of code .uni-ts corresponding to contacts 4 and 5 and a second component consisting of code units corresponding to contacts 1, 2 and 3, I con- .template that the separation' may be made in other ways. For example, the first component might consist of a single codeunit and the second component would then consist of four code units. The illustrated embodiment is, however, preferred since this arrangement permits use of the smallest number of individual oscillators or other frequency-determining means.

Each of theoscillators 101 to 111 (and oscillator 1:12,

if present) have their own individual frequency, and

each frequency is 'different from every other frequency.

The rst phase ofthe signal is a single `frequency which is `diiferent from any other .frequency transmitted by the apparatus. Similarly, the second phase-of the signal is a single frequency which is different from any' other frequency which istransmitted. The useof single frequencies in this manner eliminates the sending of complex tones and reduces the'likelihoodgof errors or losses in transmission. -The receiver will of course be capable of 'stinguishing between the frequencies which are used in the iirst phase of the signal and those which are used in the second phase, and there is no need for synchronism of the receiver with the transmitter. The irstl phase of the signal may be allowed to persist as long as a key is kept depressed. 'I'he second phase of the signal will persist until another key has been depressed or until the `energy in the capacitor 44 of the relay 42 has been dissipated. Any convenient time interval may be permitted to elapse between the second phase of one signal and the iii-st phase of the next subsequent signal. This arrangement permits transmission at any desired speed and the speed of transmission need not be constant.

Description of the receiver for tape printing The Wiring diagram shown in Figure 2 illustrates apparatus intended for use with a tape printer such as that described and claimed in my co-pending application, Serial No; 309,033, filed September 1l, 1952, now Patent No. 2,742,532. Thetape printer of that application includes an angularly and rectilineanly movable type font. The type fontis movable relative to a striker arm which operates to force the tape and an inking ribbon against `a character on the type font. The angular and rectilinear orientation of the type font to :bring the desired `character to the tape andV striker arm is 'controlledfbyften solenoids, three of which control the angular positionwof the Ytype font, and seven of which control the rectilinearA position of the type font. 'Ilhe type font has neutral angular and rectilinear positionsI which it occupies when the corresponding solenoids are not actuated. "Al-l of the relay contacts shown in Figure 2 are illustrated in the positions which they occupy when the relays are not energized'with t 'e'eXception of the relay 344 which is shown in the energized-position.' `4 i Reference numeral 201 designates the driving coilV of a multi-reed relay of the type described and claimed in my co-pending application, Serial No. 283,626.; tiled April 22,.' 1952, now Patent No. 2,691,749.I lselectively vsensitive relays-associated vv-ith. the reeds=202, 203,204,

205v respectively. 'lfhewreferencenumeralsy 218, .2219-, 220, 221, 222', .-223 and :224 designate sensitive relays associated. with reeds 201'- to .213fnespectively. .A-contact V225 is positioned in the .path :of vibration ofgtlzieA reed 202 from, which this contactreceives-.positive current tromba positive current-source226r-whenfthe reed 202.1is1vibrating. Current will tlfnisabe caused to dow througlrfthelcoil of Vrelay. T214 'to ground .227. 'Alcondenser .228 andv "a currentalimiting resistor:122'9sh11nty thelcoiliofrelay 214 to prevent .deenergization Iof that vrelaiyduring .those phases of the vibration of thelree'd V202-Wliienfiti's not-in contact witlrfco'ntact 225'. .'I-lhe relay 2'14`c'ontrols -the position ofianarlmature230. A contact231 and -acondenser-resistor combination 232 similarly "associated with-the 5203 andv thewinding-fot relay '215. VContacts 2331 and -23'4 and condenserresifsto'r combinations 235fa`nd 236 are similarly associated with the reeds 204 andi205-a nd the windings of relays"21"6f'a1nr1'217l jrespec-r tively. v The/relay 215 controls thel'position of anl armature 3237, delay-'2156- controls Van armature 238, and `relay 21'7 controls an armature 239. y Y

vContacts 240, 241, 241e, 242, 243, 244 land 245 are associated with. lreeds v207 vto 213 respectively. Condenser-resistor"combinations 246', 247, 248 249, 250,251 and-'V252' are connected in vshunt withthe windings of relays 218 to 224"respectively for the purpose described above. The windings of relays 218 'to 224v control the positions'fof armatures 253, 254, 255, 256, 257,. 2,58 arid' 259 respectively.

'-'Re'ference numerals 260,261 and 262` designate double coil relays. Y'Ih'e Arelay 260 `controls 'armatures 263Y and 264, relay' 261 controls armatures 2'65 and '266, and relay*v 262"controls "armatures 267 and. 268. Armature 263isarranged to Yclose la `contact 269 and armature` 264` closes a contact'27i0'. Armature 265 closes a contact 27'1 and armature 266 closes a contact 272. Armature 267 is arranged. to'close a contactf273`and armature 268 is arranged to close a contact 274. rThe reference numeral275 designates a single coil relay arranged to controll andarmature 276`ihaving a contact 277.

Contacts 278,279, Y280, 281, 282, 283 and284 areV positioned -tohbe vclosedby the armatures 2 .53 to.259vre specti'vly to control. the energizationof Vrelays 285, 286, 287,288, 289,290 and 291 respectively. Relays 285 Vto 29.1."controlf-armatures292, 293, 294, 295, 296,297

and 298 respectively. These. armatures are .provided withicontacts 299,300, 301,. 302, 303, 304 and 305.A u A'Refers'nce numerals 306, '307, 3.08 designate rotary solenoids'which are used. to control the. angular orienta-l tion Vofthe type'font. The rotary 'solenoids` which` are usedto V'control the rectilinear orientation of the, typezfont are-designatedfby the-reterleuce numerals 309, 310,311,- 312, 313, S14-.and 315.

, YReference numeral316zldesignates va relay which isi'provided. with.:armatures 317, v and .318.fl1avingV contacts. 319:

and f-respectively. Dhe winding'olrelay 31.6is connected in seriesgbetweenthelocking coilsof relays260, 26h-and e262? and thenegative or groundV connection 321 Ref'erence-numera-l-322 designatesV a relay4` which `controls armatures 323 and 324-,v whicharearranged. .to engagey ncrmallvfclosedfconta'cts .325.and. 326..respectively;` A

condenser 327 iseonnected in shuntwith the winding-Toi relay-,1322. The winding Vof .relay `322 is connectedlin s erie'sgbetween'tlie windings of relays28'51o291 .,incl'u.-A s iveand thenegative, .or ground connection 321. purpose vof the capacitor 327 :is to .cause a. temporary surge-through any'one.of the windings otrelaysi285 to 29.1 wherrany: onev of such windingsnis energized. Y f "bfI'hereference numeral-328 designatesa. relay having4 awinding connected in series between theoperating Acoils ofa-tela-ysI 260, 261, -262 andV 275 and the negative` or ground terminal 329. Current will thus -ow through theswindingof relay 328 when-any one oftherelays 260, 261,`.262.and 275' areV energized. The relay 328controls` armatures-330fand 331 which are'provided with contacts. 332l=and-333 respectively; 'YF-hereference numeral 334 designates a relay which controls "an armature 335-. combination condenser-resistor 336 controls the releasev timero the armature. 335. Referencewnumeral 33T-des.- ignates; a self-locking relay, the locking; of. which is `,performedzby' engagementr of the armaturey 338 with a. contact 339 connected to a positive current source 340. The relay.337also controls an armaturei341 arrangedto enga'geia cnntact 342 tofcontl'ol` the yerregization of the, font positioning 'soleno'ds and the energization of.V the lockingcoils of therelays 260, 261aud 262. Tllhecon-fv tact'.342.isupreventedilfnomJarcingby the resistor-capaci torcombination:'designated by the referencel numeral 343. Lprintingfcontrolrelay 344 controls armatures 345 and 346 having contacts 347 and 348 respectively; resistoncap'acitorcombination 349 controls Ythe release time offthe 'relay '344.' 'The'V reference numeral"350 designates the. printer actuating solenoid which-.causes the'st-rilier` armftofpressfthe tapefand inked ri-bbon-agai11stthe oriented 'type Afont. The .reference numeral l351 designates the terminal' or connection of the spacingsolenoid. Y

Apparatus. for .orientation of the type Y printing The apparatus for orienting `the .type 'font andl for printing is illustrated in Figures 3 and 4V andembodies mechanical linkages described and claimed in my copending-v application, Serial No. 301,402, 'filed Iuly28', l'952,noW-'Patent No. 2,680,970. The type fon-tdesi'g'- nated general'lywbyl the reference numeral 360is provided with an arcuate face 361 havingprinting characters longitud'inally and vertically spaced thereon. The-type-font 360V is longitudinallyeand angularly movable on ahorizonta'l rod 362 whichis'shown as 'rigidly supported? by'a standard 363. Angular orientation of /thetypefontvis controlled-by the apparatus illustrated in Figure 3,'while' the longitudinal or rectilinear orientation ofthe type font is accomplished by the apparatus" illustrated inV Figure 4. Y 'Referring particularly to Figure 3, a leverj364 is mounted on a fixed pivot 365 and a lever366 is mounted ona xed pivot`367. A tension spring member 368'I urgesfthe'free' end ofthe/lever 364 againsta stop member 369an'dv also urges the free end of the lever 366': against a-stoprnernber 370. A linky 371 is pivotally' connected to thelever l36'4at'3`72 and a 1ink37'3 is pivotally connectedl font .and .for

to the lever 366.1, The'linksf371 andV "373are conmected'A shown in 1their"deenergized:positions It will be apparent from inspection 'oFFigure that energizationof' rotaryfsolenoid-306lwill cause its'movable? arm'380'to-depress the lever364` andto causecloekwise movement of' thetype font 360. Energi'zation-f'ofthef, "solenod1-f307: -willfcauseazitsfmovablearm '3'81Iito depress;

anemie the lever 364 by a lesser amount and will consequently cause lesser clockwise movement of the type font. Energization of the solenoid 308 will cause its movable arm 382 to raise the lever 366 and to cause counterclockwise movement of the type font 360. When none of the solenoids 306, 307 or 308 are energized the type font will occupy a neutral angular position. There are thus four available angular positions of the type font and the type font carries four horizontal rows of characters on its face 361.

The arrangement for accomplishing rectilinear or lon-V gitudinal orientation of the type font is illustrated in Figure 4. A T-shaped lever 383 Vis mounted on a xed pivot 384 and is urged toward a xed stop member 385 by means of a torsion spring mernber386.A A generally L-shaped lever 387 is mounted on a lixed pivot 388 and is urged toward engagement with a stop member 389 by means of a torsion spring member 390. A li-nk391 has one of its ends pivotally connected to the lever 383 `at 392. The opposite end of link 391 is' pivotally connected to a type font actuating rod 393 at 394. A link 395 is pivotally connected to the lever 387 at 396. The opposite end ofthe link 395 is pivotally connected to an intermediate portion of the link 391 at 397.

The rotary solenoids `309 to 315 described above are designated by similar reference numerals in Figure 4. The solenoid 309 is shown in its energized position in whichit has engaged one leg of the lever` 383 and has caused rightward movement of the type font 360 from the neutral horizontal position which it occupies when none of the solenoids 309 to 315 is energized. The

rightward movement of the type font from its neutral horizontal position is accomplished by means of the solenoids 309, 310, 311 and 312 and the extent of such rightward movement is controlled by the distance which the energized one of these solenoids is located from the fixed pivot 384. Leftward movement of the type fonty from its neutral horizontal position is accomplished by means of the solenoids 313, 314 and 315 and the extent of such leftward movement is controlled by the distance which the energized one of these solenoids is spaced fromV the llxed pivot 388. It will thus be seen that the type font 360 has four horizontal positions to the right of its neutral horizontal position and three horizontal positions to the left of the neutral horizontal position. There are thus eight horizontal positions of the type font and there are eight vertical rows of characters the type f ont.

By energization of the proper solenoid or solenoids, the` desired character on the face 361 of the type font can be positioned in the path of movement of the striker arm 398 which is pivoted at 399 and which is actuated by the solenoid 350 described above. An inked ribbon 400 is positioned adjacent the face 361 of the type font and the tape 401 to be printed ispositioned between theA striker arm and the inked ribbon. It will be understood that the solenoid 350 is energized to print the desired character after the type font has been oriented.

Operation of the receiver for tape printing 206., The. rst audio tone in the case of the letter Y will consist of the single frequency of the frequency.- determining element 110 of the transmitter. It will be assumed that the reed 202 is resonant to this frequency and that this reed and this reedonly will vibrateduring the first phase` of the signal. `Vibrationof the -reed 202.- will close contact `225.and will .permit 4current to flow*I on the face 361 ofV gage contact 270. The'fw of current through relay 328 soV causes amature 330 to engagev contact332 and causes armature 331 `to engage contact 333. p Engagement of amature 264 with contact 270 provides acircuit for ow of current from positive current source 404 through the angular positioning solenoid 306, the contact 270 and armature 264 to negative or ground terminal 405. Energization of the solenoid 306 causes angular movement of the type font yto place the horizontal row of characters containing the letter Y adjacent the striker bar 398.

The engagement of contact 333 by the armature 331 causes current to llow -from positive current source 406 through theA winding 334 to negative or ground terminal 407 thereby causing armature 335 to engage contact 408. Current then `ows from positive current source 406 through armature 330, contact 332, relay 337, armature 335,` contact 408, contact 347` and Iarmature 345 to negative or ground terminal 409. The ow of current through relay 337 causes armature 338 to engage contact 339 and also causes armature 341 to engage contact 342. h Engagement of Ycontact 339 by armature 338 `completes the circuit from positive current source 340 through relay 337, armature 335, contact 408, contact 347 and armature 345 to ground connection 409 thereby locking armature 338 in engagement with contact 339 and locking armature 341 in engagement with contact 342. Current can then ow from positive current source` 340 through contact 342, armature 341, contact 269, armature 263, locking coil of relay 260, and relay 316 to ground terminal 321. This dow of current through relay 316 causes armature 317 to Adisengage contact 319 and also causes larmature 318 to disengage contact 320. The disengagement of amature 317 and contact 319 prevents 'the possibility of the spacing solenoid connected to terminal 351 being operated `under the conditions being described. `Disengagement of armature 318 and conv4 apparatus for the subsequent tact 320 conditions the operations herein described.

VThe circuit arrangement described above persists while the rst phase of the. signal-is being received and reed 202 is vibrating. When the rst phase of the signal ceases, reed 202 `will stop vibrating and will no longer make engagement with contact 225. Current will cease ilowing through relay 214 and armature 230 will disengage contact 402 which will in turn cause current to cease owing through relay 328, thereby diseng-aging armeature 330 from contact 332 and disengaging amature 331. from contact 333. However, current will continue toilow through relay 337 so long as the condenser-r sis'tor` combination 336 associated'wi-th the relay 334 prevents armature 335 from disengaging contact 408. The value of the condenser-resistor combination 336 is sufficient to keep armature335 in engagement'with contact 408 long enough to complete a cycle of operation.`

So ylong -as Vthe armature 341 is in engagement with contact 342 the system -is in conditionto receive the second phase of the signal, since a positive source ofV current is' supplied from positive' current source 340 through contact 342 and armature 341 to the armatures 253 to 259 inclusive. lThe second tone or second phase of the Y signal will consist of the single frequency determined by the frequency-determining element 103 of Figure 1 and will be assumed to cause reed 212 to vibrate.

The vibration of reed 212 will cause engagement of that reed with contact 244 thereby causing flow of current rornpositive current. source 410 through relay 223 to aroundl terminal 411..U The flow of current .through ref lay 223 .causes armature 258 .to engage contact 283,` therebyfcausi-ng current to owthrough relay 290 and relay 322- toground...terminal v321. The ow oli current'through relay :290 causes-armature 297 'to engage contact 304 and the flow rof current through relay .322 causes Varmature `33234 to disengage .contact 325. and also causes. armature `324 to disengage contact326; The engagement of arma.ture258.fand contact 283 also provides a source of positive current. for the horizontal typef'ont positioning solenoid .3.14 which is connected .to .ground term-inal 412. Energization of thesolenoid314causes the type. font. to be -movedflongitudinally .to the position. in whichv the character .Y v.is adjacent: thestniker. arm.

Engagement oi armature 297 vwith contact 304- also provides a source of positive current to -lock the relay 290 andthe relay 322 in. energized condition. Thiscondition persists as long as armature341 isinengagement with contact 342.

Disengagement of armature 323V andcontact 325 removes the possibility of relays 260, 261., v262 and 275I being again energized.beforethecharacter printing operation iscompleted.v .Disengagement offen-mature 324 and contact 326 causes current to cease. liowingv from positive terminal 413 through relay 344 to negative terminal 414. The cessation of -flow of current. through relay 344 causes armature 345 to disengage contactv 347 .and causes armature 346 to engage contact 348v but these .actions do not occur immediately becauseof. the `presence of the condenser-resistor combination y349. The; condenser ofthe condenser-resistor..combination v349 will maintain. current in. relay 344 long enough to` permit .the horizontal positioning solenoid 314` to move the type font `into printi'ngv position. Thereupon the engagement of. armature 346 and contact 348 will cause current. to flow from positive current source 415 through .printer actuating solenoid 350 to negativev terminal 416. The character Y will-thus be printed on` the tape.

Disengagement of armature `345 and contact 347 occurs simultaneously with theprinting operationand removes the negative terminal 409 from the circuit supplying .the relay 337, thereby disengaging :armature 338 from. contact. 339 and also disengaging armature.. 341 from contact 342. The disengagement of. amature 33S from contact 339removes the source of. locking current from relay 337. `Disengagement of armature 341 and contact 342 removes vthe. source. of positive current supp lying. the relay 290,A the relay 322, the. relay 316 and the locking. coil of the relay 260 thereby .placing the system in condition to receive the rst pl'rase` of. a new signal. In the event the second phase of the signal persistsV beyond the period of time required to completev the` printing operation the system is not aiected, since the source of current necessary to energize relays285 to 1291 inclusive is removed when armature 341 disengages contact 342 v The purposeof condenser 417 is vto causecurrent to continue to flow through relay 337 for ashort. interval of time after armature345 has disengaged. contact 347 to permit the printer. striker arm to complete. itsstrokebefore .-thetypefont orienting solenoids. beginto' return to their .normal deener'gized. positions.

AKA'Had the first phase of the signal vconsisted of `a character whichv did .not cause vibration of any of the reeds 202.

to. 264, the audio toneof the rst phase would; .be resonant. with the reed 205 in which case the .function of .thefrst phase. of the` signal would beto condition the apparatus to be operative. upon receipt of vthesecond. phase. ofthe signal. This is Laccomplishedby ltite'engage.-

-rnent of .armature .239v with contact 418' which causes current to ilow through relay275fandirelay 328. In the eventfthe. second phase of thesignal. is off :afirequency which does not causev vanyoi there'eds l2051 vto n2113' to vibrate;A the-audio tone of theY second .phase willxagain be resell-ant.l with.' reed. and armature 1239 would engage contact 418. However, vin this instance the rst phase of Athe signal would have been of a frequency to cause. oneofthe reeds V202, 203 or 204 to vibrate and this first phase-of the signal would have caused continued lowof current through relay 316, and armature 3-18 would be vout of engagement with contact 320 when` the second phase.l of the signal was received. Therefore, when relay .275 wasY energized by engagement of armature 239 with contact 418, the circuit from positive terminal 413 would be broken at the armature 318 and would also be broken at thecontaot277 Vand the source of current supplying relay 344 would thereby be removed with the result that the printing operation would be performed.

Description of `the receiver-for Vuse as a tape reperforator or for use llwith a`c0nventional sequential tone `type teleprnter The receiver illustrated in Figure 2 may be modified for use in 'connection with conventional sequential tone typeV teleprinting equipment. As so modified the receiver canalso be used in connection with a tape reperforator of conventional design. To accomplish theses objectve's it isnecessary to convert the two tones or phases of the signal back into the conventional tive-unit code from which thesignal originated.

"Figure 5 represents 'diagrammatically the receiver as modified Vfor* use with a tape reperforator. However, the punch selecting solenoids of the reperforator may be considered aspthe equivalents of the selector bars ory a/fconventional teleprinter and the tape perforating solenoid maybe considered as` the equivalent of the printing actuator of a conventional teleprinter. For purposes of illustration the receiver illustrated in Figure 5 will be' described for use in connection'with a tape reperforator;

Except for'the modifications hereinafter described the receiver shownin Figure 5 is thesame as that illustrated in Figure 2. For that reason the same reference numerals are applied tothe corresponding elements.

Contact 420 Vhas been added and normally engages the armature 264 of the relay 260. A similar contact 421 has been' added which normally engagesV the armature 266 of the relay 261. Single-pole double-throw switches have been addedY to be actuated by the relays 285l to 290 inclusive.. The armature of the switch actuated by relayy 285 is designatedby the reference numeral 422 and isr provided withV a normally closed contact 423 and a normallyopen contact 424. The armature of the switch actuated by relay 286 is designated by the reference .numeral 425 and is provided with a normally closed contact 426 and a normally open contact 427. Arranged to be actuated by the relay 287 isan armature 423 having associated therewitha normally closed contact 4.29 and a normally open contact 430. The armature V431' which is actuated by relay 288 is provided with a normally.

closed contact 432 and a normally open contact 43'3. Similarly the-armatures 434 and '435 Vare provided with.

normallyclosed contacts 4`36-and 437 respectivelyand normally open contacts 438 land 439 respectively. Thearmaturc 44.0 whichfis actuated by the relay 291 is pro-- vided witlh a single normally open contact 441.

The `'electrical connections ofthe added contacts and switches are arrangedV so that vrelay 260 controls "energization of punch vselecting solenoid 442 which may select n punches representing code'element 5 of the conventional teleprinter code. punch vselecting solenoid 443 which may select punches representing vthe conventional teleprinter code element 4.

Relay262 controls energization of both punch selecting solenoids 442- and 4413. Relay 285 controls energizationY of punch-selectingsolenoid 444 which may select Vpunchesv representing theconventional teleprinter code element 1.

Relay-286y controls energization of punch selectingfsolenoid *445- 'which -may select' punches representingV the conventionaht'eleprinter code element 2. RelayY .237

'controls yenergizatiorr :of 'punch .selecting `.solenoid 4.46,

Relay 261 controls Venergization ofV which may select punches representing the conventional teleprinter code element 3. Relay 288 controls simultaneous energization of punch selecting solenoids 444 and 445. Relay 289 controls simultaneous energization of punch selecting solenoids 445 and 446. Relay 290 controls simultaneous energization of punch selecting solenoids 444 and 446 and relay 291 controls simultaneous energization of punch selecting solenoids 4'44, 445 and 446.

The printer actuating solenoid 350 of Figure 2 has been replaced by a punch actuating solenoid 447 which is connected in series between the contact 348 and the punch selecting solenoid 446. The punch actuating solenoid 447 performs the function of perforating the tape after the proper punch selections have been made in much the same manner that the printer actuating solenoid 350 actuates the printer bar in the arrangement of Figure 2. v

The armature 317 and the contact 319, associated with relay 316, in Figure'Z perform no function in the modification of Figure and they have been eliminated in this modication.

Operation of the receiver as a tape reperforator With the exception of the modifications described above the operation of the receiver of Figure 5 is essentially the same -as the operation described in connection with `Figure 2. Let it again be assumed that a signal representing the letter Y which consists of code elements 1, 3 and 5 of the conventional teleprinter code has been transmitted, The first phase of the signal will cause the same action as described above in connection with Figure 2. The engagement of armature 264 with contact 270 will cause current to flow from positive terminal 450 through punch selecting solenoid 442 to negative or ground terminal 45'1. Energization of punch selecting solenoid 442 causes the selection of punches representative of code element 5 of the conventional teleprinter code. These punches are locked in selected position to perforate the tape in a manner representative of this code element when the punch actuated solenoid 447 is energized. The second phase of the signal -will Vcause current to flow through relay 290 and cause armature 435 to engage contact 439. Current will then flow from positive terminal 453 through contact 439, armature 435, |armature 434, contact 436, contact 423 and armature 422 to punch selecting solenoid 444. At the same time current will How from the positive terminal 453 through the contact 439, armature 435, armature 431, contact 432, contact 429 and armature 428 to punch selecting solenoid 446. It Will be remembered that punch select- 4ing solenoids 444 and 446 select punches which are representative of code elements 1 and 3 of the conventional teleprinter code. Those punches are located in positions to properly perforate the tape when punch actuating solenoid 447 is energized. Y p

. In the manner previously described in the description of `Figure 2 when current flowed through relay` 290 action was initiated to cause current to cease flo-wing through` relay 344, resulting in engagement of armature 346 with contact 348 and disengagement of armature 345 and contact 347. `When armature 346 engages contact 348 the circuit is completed from positive terminal 340 through v armature 346, contact 348 and punch actuating solenoid 447 to negative terminal 451. The punch actuating solenoid 447 is thus energized and the tape is perforated with, the previously selected punches.

. When armature 345 disengages contact 347 the previously described system clearing action is initiated and the apparatus is prepared for the reception of a subsequent signal.

The tape perforated in this manner can be used to store the signals constituting a message or the tape can be used for re-transmission of a message on or to conventional sequential tone teleprinterequipment.

I have illustrated and described what now consider to be the preferred embodiments of my invention. It will be understood, however, that various modifications may be used without departing from the broad scope of the invention which is define by the following claims.

I claim: i

l. Apparatus for reception of an intelligible alphabetical signal transmitted as individual first and second tones constituting first and second signal phases, said apparatus comprising an angularly and rectilinearly movable type font, printer-actuating mechanism cooperating with said type font to record selected characters from said font, a first tuned reed vibrating in response to the tone of one of said signal phases, rst relay means responsive to vibration of said first tuned reed, a first solenoid controlled by said first relay means to impart an angular orienting movement to said type font, a second tuned reed vibrating in response to the tone of the other' of said signal phases, second relay means responsive to vibration of said second tuned reed, a second solenoid controlled by said second relay means to impart a rectilinear orienting movement to said type font, means associated with the relay means responsive to the rst signal phase for locking such relay means to hold the solenoid controlled thereby in actuated condition during the second signal phase, and means connected to actuate said printer-actuating mechanism responsive to said second signal phase.

2. Apparatus for reception of an intelligible alphabetical signal transmitted as individual first and second tones constituting rst and second signal phases, said apparatus comprising an angularly and rectilinearly movable type font, printer-actuating mechanism cooperating with said type font to record selected characters from said font, a first tuned reed vibrating in response to the tone of said rst signal phase, first relay means responsive to vibration of said first tuned reed, a first solenoid controlled by said first relay means to impart an angular orienting movement to said type font, a second tuned reed vibrating in response to the tone of said second signal phase, second relay means responsive to vibration of said second tuned reed, a second solenoid controlled by said second relay means to impart a rectilinear orienting movement to said type font, means associated with said first relay means for locking such relay means to hold said first solenoid in actuated condition during said second signal phase, and means connected to actuate said printer-actuating mechanism responsive to said second signal phase.

3. Apparatus for receiving and recording on perforated tape an alphabetical signal transmitted as individual first and second tones constituting first ,and second signal phases, said apparatus comprising a plurality of punch selecting solenoids, a tape perforating solenoid, a first tuned reed vibrating in response to fthe tone of said first` signal phase, first relay means responsive to vibration of said first tuned reed and controlling actuation of certain of saidpunch selecting solenods, a second tuned reed vibrating in response to the tone of said second signal phase, second relay means responsive to vibration of said second tunedreed and controlling actuation of certain other of said punch selecting solenoids, means for locking said first relay means to hold the punch selecting solenoids controlled thereby in actuated condition during said second signal phase, and means responsive to said second signal phase to actuate said tape perforating solenoid to perforate a tape with the punches selected by said punch selecting solenoids.

4. Apparatus for receiving and recording an alphabetical signal transmitted as individual first and second tones constituting first and second signal phases, said apparatus' comprising a plurality of punch selecting solenoids, a tape perforating solenoid, a first tuned reed vibrating in response to the tone of the first signal phase, means responsive to vibration of said first tuned'reed to actuate*certainA asso-,91aN

tuned reed to actuate certain other of said punch-select-- ing solenoids and to also actuate said tape perforating solenoid tto perforate a paper tape with theV selected punches. Y

5. Apparatus for receiving and printing an intelligible` alphabetical signal transmitted as individual first andsecond tones constituting first and second signal phasesfsaid apparatus comprising-a movable type font, printer-actuating mechanism cooperating with said type font torecord selected characters from said font, a first tuned yreed vibrating in response to the tone of said first signalphase, first, relay means` responsive to vibration of said first tuned reed, a first solenoid controlled by said first relay means to impart an initialrorienting movement to said type font, a second tuned reed vibrating in response to the tone of said secondsignal phase, `second relay means responsive to vibration of said second tuned reed, a second solenoid controlled by said second relay means to impart a final orienting movement to said type font, means associated with said first relay means to hold said rst solenoid in actuated condition dur-ing said second signal phase, and means 'connected 4to actuate said printer-actuatingl mechanism responsive to said second signal phase to print an valphabetical character determined by the oriented position of said type font.

6. A method of transmitting and receiving intelligible alphabetical signals which comprises representing the alphabet as a five-unit code, separating such five-unit code into a first component of at least two code units and a second component of the remaining code units, expandingthe first component by binary progression into a first group of parts, expanding; the second component by binary progression into a second group of parts, assigning individual identities to each part of each group, alternately transmitting a single part from the first group and a single pant from the second group to transmit an alphabetical signal, converting the part from the first group at a receiver into its corresponding units of the said five-unit code, converting the part from the second group into its corresponding units of the said five-unit code, and recording the said units of the ve-unit code at the receiver.

7. AV method or transmitting and receiving intelligible alphabetical signa-ls which comprises representing thealphabet as a five-unit code, separating such five-unit code into a first component of at least two code units and a secondcomponent of the remaining code units, expanding the first component by binary progression into a first group of parts, expanding the second component by binary progression-,into aV-second group of parts, assigningindividual identities -to each part of each group, Valternately transmitting a single part from the first group as a first signal phase and a' singlepart from the second group .as a second signal phaserto transmit an alphabetical signal, utilizing the lfirst signal phase at a receiver-to perform one of a plurality of operations necessary to the recording ofthe alphabetical signal transmitted, and utilizing the-second, signal phase 'to complete theoperations neces,- sary to the recording of the alphabetical signal transmitted. V v

8. A method of transmitting and receiving intelligible alphabetical signals; which comprises representing the alphabet `as a five-unitcode, separating such five-unit code into two Vcomponents of two and three units respectively, expanding the two-unit component by binary progression into agrouprof four parts, Aexpanding the three-unit component `by binarylprogression into a group of eight-parts, .assigning individual identities to eachpart of each group, alternately transmitting a single part from the four-partsgroupend .a single part from the eightpartrgroup to. transmit antalphaoetical signal, converting 'thepartfrom the Vfour-.part groupat areceiver into its corresponding units of the said five-unit code, converting g the part from the eight-part group into its correspond-t; ing units of the said five-unit code, and recording the said units of the five-unit code at the. receiver.

9. A method of transmitting and receiving intelligible alphabetical signals which comprises representing the alphabet as a five-unit code, separating such five-unit code into two components of two and three units respectively,`

expanding the two-unit component by binary progression into a group of four parts, expanding `the three-unit component by binary progression :into a group of eight parts,l assigning individual identities to each part of each group,

transmitting a single part from the four-pant group as a rst signal phase and a single part from the eight-part` group as a second signal phase to transmit an alphabetical signal, utilizing the first signal phase at a receiver to perform one of a plurality of operations necessary to the.

recording of the alphabetical signal transmitted, and utiiizing the second signal phase to complete the operations necessary to the recording of the alphabetical signal transmitted.

1,0. A telegraph printer for reception of an alphabetical signal transmitted as individual first and second tones constituting first and second signal phases, said apparatus comprising angularly and rectilinearly movable type font having a neutral position, a frstmechanism for imparting angular movement to said type font, a second mechanism for imparting rectilinear movement to said type font, each of said mechanisms comprising a pair of levers which are independently oscillatable about fixed axes, means for biasing said levers toward definite normal positions of said levers, a pair of links pivotally'connected to said levers at points spaced from the fixed axes there of, said links being pivotally connected together-by a pivot pin which occupies a definite neutral position when both said arms are in their normal positions, means connect-y ing said pivot pin of said -iirst mechanism to said type' font to impart angular movement to said type fontV from its neutral position upon movement of such pivot pin from its neutral position, means connecting said pivot pin of said second mechanism to said type font to impart recti` linear movement to the type font from its neutral position upon movement of the said pivot pin of the second mechanism from its neutral position, a first group of solenoids positioned adjacent the levers of said first Vmechanism at different distances from the axes thereof, first relay means on--the one of said solenoids of said first group which is energized, a second group ofV solenoids positioned ad-` jacent the levers of'said second mechanism atV different distances from the axes thereof, second relay means responsive to the other of said signal phases'for selectively4v energizing one only of the solenoids of'said second group to move said type Vfont rectilinearly in one direction or orientation ofsaid type font.l

" l1. A telegraph printer for reception of an' valphabetical signal transmitted as'individualVfirsraird'V second'tones constituting, first andjsecond signalv phases, said apparatus comprisingv a type font 'having aneutral' vposition and j being movable angularly and rectilinezu'ly from such neutral position, a first mechanism for imparting angular movement to said type font, a -seeondtmechanism for imparting rectilinear movement to said type font, .each of said mechanisms comprising a lever which is .oscillatableY about a fixed axis,` meansfor biasing said lever toward a definite normal position, means connectin'gsaid lever of said first mechanism to said type font to impart, angular movement to` said type font from its neutral` position upon movement of such lever from its normal position, means connecting said lever of said second mechanism to said type font to impart rectilinear movement to the type font from its neutral position upon movement of the said lever of the second mechanism from its normal position, a iirst group of solenoids positioned adjacent the lever of said first mechanism at different distances from the axis thereof, first relay means responsive to one of said signal phases for selectively energizing one only of said first group of solenoids to move said type font angularly from its neutral position by an amount dependent on the one of said solenoids of said rst group which is energized, a second group of solenoids positioned adjacent the lever of said second mechanism `at different distances from the axis thereof, second relay means responsive to the other of said signal phases for selectively energizing one only of the solenoids of said second group to move said type font rectilinearly from its neutral position by an amount dependent on the one of said solenoids of said second group which is energized, and means for printing an alphabetical character corresponding to the angular and rectilinear orientation of said type font.

12. Apparatus for reception and recordation of an intelligible functional signal transmitted as individual first and second tones constituting first and second signal phases, said apparatus comprising a first group of tuned frequency sensitive means each responsive to a different signal tone of said first signal phase and each having relay means operable in response to the receipt of the signal tone to which its frequency sensitive means is tuned, a second group of tuned frequency sensitive means each responsive to a different signal tone of said second signal phase and each having relay means operable in response to the receipt of the signal tone to which its frequency sensitive means is tuned, a signal recording mechanism including signal selecting means and means for recording the selected signal, said relay means being connected to operate said selecting means in accordance with the particular one of the relay means of said iirst group of frequency sensitive means and the particular one of the relay means of said second group of frequency sensitive means which is operated, and means interconnecting the relay means of saidsecond group of tuned frequency sensitive means and the relay means of said first group of frequency sensitive means to render the relay means of said second group of frequency sensitive means ineffective to control operation of said selecting means in the absence of prior operation of one of the relay means of said first group of frequency sensitive means.

13. Apparatus for reception and recordation of an intelligible functional signal transmitted as individual rst and second tones constituting first and second signal phases, said apparatus comprising a first group of tuned frequency sensitive means each responsive to a different signal tone of said lirst signal phase vand each having relay means operable in response to the receipt of the signal tone to which its frequency sensitive means is tuned, a second group of tuned frequency sensitive means each responsive to a different signal tone of said second signal phase and each having 'relay means operable in response to the receipt of the signal tone to which its frequency sensitive means is tuned, a signal recording mechanism including signal selecting means and means for recording the selected signal, said relay means being connected to operate said selecting means in accordance with the particular one of the relay means of said lirst group of frequency sensitive means and the particular one, of the relay means of said second group of frequency sensitive means which is operated, means interconnecting the relay means of said second group of tuned frequency sensitive means and the relay means of said rst group of frequency sensitive means to render the relay means of said second group of frequency sensitive means ineffective to controloperation ofusakid selecting means in the absence of prior operation of one of the relay means of said first group of frequency sensitive means, holding means for the relay means of said first group of frequency sensitive means to retain the operated one of such relay means energized pending operation. of one of the relay means of said second groups of frequency sensitive means in response to the second tone of a two phase signal, the relay means of said second group of frequency sensitive means being connected with the means for recording the signal of said signal recording mechanism so as to initiate actuation of the signal recording means upon operation of one of the relay means of said second group of frequency sensitive means.

14. Apparatus for reception and recordation of an intelligible functional signal as recited in claim 12 wherein said interconnecting means between said second group of tuned frequency sensitive means and said first group of frequency sensitive means includes means for holding said interconnecting means conditioned to permit the second group of frequency sensitive means to control 0peration of said selecting means in response to a signal tone of said second signal phase for 'a predetermined time period following cessation of response of one 0f said iirst group of tuned frequency sensitive means to its signal tone,

l5. The arrangement of claim 13 wherein said apparatus includes means responsive to operation of the relay means of said rst group followed by operation of the relay means of said second group .to restore said holding means -and prepare said apparatus for reception and recording of an immediately -following intelligible functional signal.

`16. The arrangement of claim 14 wherein said apparatus includes means responsive to operation of the relay means of said rst group followed within said predetermined time period by operation of fthe rel-ay means of said second group to restore said holding means and prepare said apparatus for reception and recording of an immediately following intelligible functional signal.

17. Printing telegraph apparatus for reception and recordation of an intelligible functional signal that is comprised of individual first and second tones constituting first and second signal phases, said apparatus comprising a first group of tuned frequency-sensitive means each responsive to a dilferent signal tone of said first signal phase, a second group of tuned frequencysensitive means each responsive to a different signal tone of said second signal phase, la signal-recording mechanism including signal-selecting members and means for recording the selected signal, first-phase electric circuit means distinctively operable in response rto the receipt of a first-phase signal tone to which one of said first group of frequency-sensitive means responds, secondphase electric circuit means distinctively operable in response to the receipt of a second-phase signal'tone to which one of said second group of frequency-sensitive means responds, means connecting said rst and secondphase electric circuit means to control operation of said signal-selecting members -in accordance with the distinctive operation of said first-phase electric circuit means followed directly by `the distinctive operation of said second-phase electric circuit means, and means responsive to operation of said first-phase electric circuit meansV followed by operation of said second-phase electric circuit means to restore and prepare said apparatusfor reception and recording of an immediately following intelligible functional signal.

18. Printing telegraph apparatus for reception and recordation of an intelligible functional signal that is comprised of individual first and second tones constituting first and second signal phases, said apparatus comprising Va first group of tuned frequency-sensitive means each responsive to a different signal tone of said first signal phase, a second group of tuned frequency-sensitive means each responsive to a different signal tonekof said second signal phase, a signal-recording mechanism including signal-selecting members and means for recording the selected signal, first-phase electric circuit means distinctively operable in response to the receipt of a firstphase signal tone to which one of said first group of frequency-sensitive means responds, second-phase electric circuit means distinctively operable in response to they receipt of a second-phase signal tone to which one of said second group of frequency-sensitive means responds, means connecting said first and second-phase electric circuit means to control operation of said signal-A selecting members in accordance with the distinctive operation of said first-phase electric circuit means followed directly by the distinctive operation of said second-phase electric circuit means, and means interconnecting said first land second-phase electric circuit means to render the second-phase electric circuit means ineffective to control'operation of said selecting members in the absence of prior operation of said rst-phase electric circuit means.-

19. Printing telegraph apparatus for reception and recordation of an intelligible functional signal that is comprised ofindividual first and second tones constituting first and second signal phases, said apparatus comprising a first group of tuned frequency-sensitive means each responsive to a different signal tone of said first signalphase, a second group of tuned frequency-sensitive means'each responsive to a different signal tone of said second signal phase, a signal-recording mechanism includingsignal-selecting members and means for recording .the selected signal, first-phase electric circuit means distinctively operable for a limited time interval in responseto the receipt of a rst-phase signal tone to Which one of said first group of frequency-sensitive means responds, second-phase electric circuit means distinctively operable in response to the receipt of a second-phase signal tone to which one of said second group of frequencysensitive means responds, means connecting said first and second-phase electric circuit means to control operation of said signal-selecting members in laccordance with the distinctive operation of said first-phase electric circuit means' followed Within said limited time interval by the distinctive operation of said second-phase electric circuit means, means interconnecting said first and second-phase electric circuit means to render the second-phase electric circuit means ineffective to control operation of said selecting members in the absence of prior operation of said first-phase electric circuit means, and means responsive to operation of said first-phase electric circuit means followed within said limited time interval by operation of said second-phase electric circuit means to restore the first-phase electric circuit means and prepare said apparatus for reception and recording of an immediately following intelligible functional signal.

20. Printing telegraph apparatus for reception and recordation of an intelligible functional signal that is comprised of individual first and second tones constituting first and second signal phases, said apparatus comprising a plurality of punch-selecting solenoids, a tape-perforating solenoid, a first group of tuned frequency-sensitive means each responsive to a different signal tone of said firstv signal phase, a second group of tuned frequeneysensitive means each responsive to a different signal tone of said second signal phase, first-phase electric circuit means distinctively operable in response to the receipt of a first-phase signal tone to which one of said first group of frequency-Sensitive means responds for controlling actuation of certain of said punch-selecting solenoids, second-phase electric circuit means `distinctively operable in response to the receipt of a second-phase signal tone to which one of said second group of frequency-sensitive means responds for controlling actuation of certain other of said punch-selecting solenoids, means connecting said rst and second-phase electric circuit means to actuate said tape-perforating solenoid and thereby operate said "20 punchingsolenoids `in accordance with the distinctive. op` eration of said' first-phase electric circuit means followed directly by the distinctive operation of said second-phase electric circuit means, and means responsive to operation of said first-phase electric circuit means followed' Vdirectly by operation of said second-phase electric circuit means to restore land l'prepa-re said apparatus for reception and recording of an immediately followingrintelligible func-V tional signal.

Z1. Printing telegraph apparatus for reception and recordation of an intelligible functional signal that is comprised of individual first and second tones constituting first and second signal phases, said apparatus comprising a movable type font, printereactuating mechanism cooperating with said type font to record selected characters from said type font, a first group of tuned frequency-sensitive means each responsive to a different signal tone of said first signal phase, a second group of tuned frequency-sensitive means each responsive to a different signal tone of said second signalv phase, first-phase electric circuit means distinctively operable in response to the receipt of a first-phase signal tone to which one of said first group of frequency-sensitive means responds for controlling actuation of a solenoid for imparting an initial orienting movement to said type font, second-phase electric circuit means distinctively operable in response to the receipt of a second-phase signal tone to which one of said second `group of frequency-sensitive means responds for controlling actuation of a second solenoid for imparting a nal orienting movement to said type font, means "connecting said first and second-phase electric circuit means to -actuate said type font and thereby operate said solen'oidsV in accordance with the distinctive operation of said first-phase electric circuit means followed directly by the `distinctive operation of said second-phase electric circuit means, and means responsive to operation of said first-phase electric circuit means followed directly by operation of said second-phase electric circuit means to restore and prepare said apparatus for reception and recording of an immediately following intelligible functional signal.

22.. A method of transmitting and receiving intelligence characters as two-phase signals which comprises establishing first and second mutually exclusive groups of tones, representing each intelligence character as a distinctive combination of a single tone from the first group and ya single tone from the second group, transmitting a selected intelligence character by sequentially transmitting a tone representative of the first phase and a tone representative of the second phase of the selected intelligence character, utilizing said first-phase tone at a receiver to perform one of a plurality of ,operationsk necessary to the recording of the intelligence character corresponding to the signal transmitted, and utilizing the second-phase tone to complete the operations necessary to said recording and to restore the receiver for receiving and recording an immediately following intelligence character signal.

23. A method of transmitting and receiving intelligence characters as two-phase signals which comprises establishing first and second mutually exclusive groups of tones, representing each intelligence character as a distinctive combination of a single tone from the first group and a single tone from the second group, transmitting a selected intelligence character by sequentially transmit'- ting a tone representative of theY flrst phase and a tone representative of Athe second phase of the selected intelligence character, utilizing said first-phase tone for initially conditioning a receiver for recording the signal transmitted and for maintaining such initial conditioning a predetermined listening interval, and utilizing said second-phase tone for finally actuating the initially conditioned receiver for recording the signal transmitted and for restoring the receiver for receiving and recording immediately following intelligence character signals.

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